readme: clarify the meaning of grout

Signed-off-by: Robin Jarry <rjarry@redhat.com>
DPDK · Jun 24, 2024 · 56d6d8d · 56d6d8d
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 # grout # a graph router based on DPDK
 
+`grout` stands for *Graph Router*. As a common English word, *"grout"* is
+a dense fluid that hardens to fill gaps between floor tiles.
+
 `grout` is a DPDK based network processing application. It uses the [rte_graph]
 library for data path processing.